FreeCalypso > hg > tcs211-l1-reconst
view g23m/objdiff/l1_ext/l1_afunc.notes @ 57:ef8ab5a0fe8f
l1_cmplx.c: low-hanging fruit
| author | Mychaela Falconia <falcon@ivan.Harhan.ORG> |
|---|---|
| date | Sun, 27 Mar 2016 06:37:24 +0000 |
| parents | 576e684603e0 |
| children |
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The result of l1_afunc.c recompilation is identical to the original up until the l1a_clip_txpwr() function, which is the last function in the module. Original 20070608 version of l1_afunc.obj, disassembly of l1a_clip_txpwr(): $l1a_clip_txpwr: ; Global ; u_char l1a_clip_txpwr(); ; Begin function ; REGPARM r0: u_char supplied_txpwr; ; REGPARM r1: u_short radio_freq; ; REG r1: unsigned "C$21"; ; REG r1: unsigned "C$22"; ; REG r1: unsigned "C$23"; ; REG r2: struct ? *"K$6"; ; REG r1: u_char "U$41"; ; REG r1: u_char "U$82"; ; REG r1: u_char "U$95"; ; REG r1: u_char "U$108"; ; REG r0: u_char power; ; REG r1: u_short radio_freq; ; REG r0: u_char supplied_txpwr; ; REG r3: int "S$20"; ; REG r5: int "S$19"; ; REG r2: unsigned "S$18"; ; REG r1: unsigned "S$17"; ; REG r3: int "S$16"; ; REG r5: int "S$15"; ; REG r2: unsigned "S$14"; ; REG r1: unsigned "S$13"; ; REG r1: int "S$12"; ; REG r5: int "S$11"; ; REG r2: unsigned "S$10"; ; REG r1: unsigned "S$9"; ; REG r3: int "S$8"; ; REG r5: int "S$7"; ; REG r2: unsigned "S$6"; ; REG r1: unsigned "S$5"; ; REG r3: int "S$4"; ; REG r5: int "S$3"; ; REG r2: unsigned "S$2"; ; REG r1: unsigned "S$1"; ; REG r3: unsigned "U$26"; ; REG r3: unsigned "U$26"; ; REG r3: unsigned "U$26"; ; REG r1: u_char "U$22"; ; REG r3: u_char "U$22"; ; REG r4: unsigned "U$30"; ; REG r4: unsigned "U$30"; ; REG r4: unsigned "U$30"; ; REG r4: unsigned "U$30"; ; REG r4: unsigned "U$30"; ; REG r3: unsigned "U$51"; ; REG r3: unsigned "U$51"; ; REG r1: u_char "U$75"; ; REG r1: u_char "U$75"; $CODE16: ; label 490: b530 push {r4, r5, lr} ; switch statement 492: 4a87 ldr r2, =_l1_config ; via 0x6b0 494: 7813 ldrb r3, [r2, #0] 496: 1e5b sub r3, r3, #1 498: 2b01 cmp r3, #1 49a: d800 bhi 0x49e 49c: e0fa b 0x694 ; GSM or GSM_E 49e: 3b02 sub r3, #2 4a0: 2b00 cmp r3, #0 4a2: d100 bne 0x4a6 4a4: e0cf b 0x646 ; PCS1900 4a6: 3b01 sub r3, #1 4a8: 2b00 cmp r3, #0 4aa: d100 bne 0x4ae 4ac: e0a4 b 0x5f8 ; DCS1800 4ae: 3b01 sub r3, #1 4b0: 2b01 cmp r3, #1 4b2: d968 bls 0x586 ; DUAL or DUAL_EXT 4b4: 3b02 sub r3, #2 4b6: 2b00 cmp r3, #0 4b8: d03d beq 0x536 ; GSM850 4ba: 3b01 sub r3, #1 4bc: 2b00 cmp r3, #0 4be: d000 beq 0x4c2 ; DUAL_US 4c0: e0f5 b 0x6ae ; default - return ; case DUAL_US: 4c2: 68d3 ldr r3, [r2, #12] ; 0xc 4c4: 4299 cmp r1, r3 4c6: d20e bcs 0x4e6 ; low band (850) 4c8: 4b7c ldr r3, =_MIN_TXPWR_GSM850 ; via 0x6bc 4ca: 497d ldr r1, =_l1a_l1s_com+0x335 ; via 0x6c0 4cc: 7809 ldrb r1, [r1, #0] 4ce: 5c59 ldrb r1, [r3, r1] 4d0: 4288 cmp r0, r1 4d2: db06 blt 0x4e2 ; line 4d4: 69d1 ldr r1, [r2, #28] ; 0x1c 4d6: 4288 cmp r0, r1 4d8: d800 bhi 0x4dc 4da: e0e8 b 0x6ae ; line 4dc: 0608 lsl r0, r1, #24 4de: 0e00 lsr r0, r0, #24 4e0: e0e5 b 0x6ae ; line 4e2: 1c08 mov r0, r1 (add r0, r1, #0) 4e4: e0e3 b 0x6ae ; high band (1900) 4e6: 6a54 ldr r4, [r2, #36] ; 0x24 4e8: 42a0 cmp r0, r4 4ea: d901 bls 0x4f0 4ec: 1c05 mov r5, r0 (add r5, r0, #0) 4ee: e001 b 0x4f4 4f0: 2120 mov r1, #32 ; 0x20 4f2: 180d add r5, r1, r0 4f4: 4b73 ldr r3, =_MIN_TXPWR_PCS ; via 0x6c4 4f6: 4974 ldr r1, =_l1a_l1s_com+0x336 ; via 0x6c8 4f8: 7809 ldrb r1, [r1, #0] 4fa: 5c59 ldrb r1, [r3, r1] 4fc: 42a1 cmp r1, r4 4fe: d901 bls 0x504 500: 1c0b mov r3, r1 (add r3, r1, #0) 502: e001 b 0x508 504: 2320 mov r3, #32 ; 0x20 506: 185b add r3, r3, r1 508: 429d cmp r5, r3 50a: db12 blt 0x532 ; line 50c: 42a0 cmp r0, r4 50e: d901 bls 0x514 510: 1c01 mov r1, r0 (add r1, r0, #0) 512: e001 b 0x518 514: 2120 mov r1, #32 ; 0x20 516: 1809 add r1, r1, r0 518: 6a13 ldr r3, [r2, #32] ; 0x20 51a: 42a3 cmp r3, r4 51c: d802 bhi 0x524 51e: 2220 mov r2, #32 ; 0x20 520: 18d2 add r2, r2, r3 522: e000 b 0x526 524: 1c1a mov r2, r3 (add r2, r3, #0) 526: 4291 cmp r1, r2 528: d800 bhi 0x52c 52a: e0c0 b 0x6ae ; line 52c: 0618 lsl r0, r3, #24 52e: 0e00 lsr r0, r0, #24 530: e0bd b 0x6ae ; line 532: 1c08 mov r0, r1 (add r0, r1, #0) 534: e0bb b 0x6ae ; case GSM850: 536: 6a54 ldr r4, [r2, #36] ; 0x24 538: 42a0 cmp r0, r4 53a: d901 bls 0x540 53c: 1c05 mov r5, r0 (add r5, r0, #0) 53e: e001 b 0x544 540: 2120 mov r1, #32 ; 0x20 542: 180d add r5, r1, r0 544: 495d ldr r1, =_MIN_TXPWR_GSM850 ; via 0x6bc 546: 4b5e ldr r3, =_l1a_l1s_com+0x335 ; via 0x6c0 548: 781b ldrb r3, [r3, #0] 54a: 5ccb ldrb r3, [r1, r3] 54c: 42a3 cmp r3, r4 54e: d901 bls 0x554 550: 1c19 mov r1, r3 (add r1, r3, #0) 552: e001 b 0x558 554: 2120 mov r1, #32 ; 0x20 556: 18c9 add r1, r1, r3 558: 428d cmp r5, r1 55a: db12 blt 0x582 ; line 55c: 42a0 cmp r0, r4 55e: d901 bls 0x564 560: 1c01 mov r1, r0 (add r1, r0, #0) 562: e001 b 0x568 564: 2120 mov r1, #32 ; 0x20 566: 1809 add r1, r1, r0 568: 69d3 ldr r3, [r2, #28] ; 0x1c 56a: 42a3 cmp r3, r4 56c: d802 bhi 0x574 56e: 2220 mov r2, #32 ; 0x20 570: 18d2 add r2, r2, r3 572: e000 b 0x576 574: 1c1a mov r2, r3 (add r2, r3, #0) 576: 4291 cmp r1, r2 578: d800 bhi 0x57c 57a: e098 b 0x6ae ; line 57c: 0618 lsl r0, r3, #24 57e: 0e00 lsr r0, r0, #24 580: e095 b 0x6ae ; line 582: 1c18 mov r0, r3 (add r0, r3, #0) 584: e093 b 0x6ae ; case DUAL: ; case DUAL_EXT: 586: 68d3 ldr r3, [r2, #12] ; 0xc 588: 4299 cmp r1, r3 58a: d20e bcs 0x5aa ; low band (900) 58c: 4b4f ldr r3, =_MIN_TXPWR_GSM ; via 0x6cc 58e: 494c ldr r1, =_l1a_l1s_com+0x335 ; via 0x6c0 590: 7809 ldrb r1, [r1, #0] 592: 5c59 ldrb r1, [r3, r1] 594: 4288 cmp r0, r1 596: db06 blt 0x5a6 ; line 598: 69d1 ldr r1, [r2, #28] ; 0x1c 59a: 4288 cmp r0, r1 59c: d800 bhi 0x5a0 59e: e086 b 0x6ae ; line 5a0: 0608 lsl r0, r1, #24 5a2: 0e00 lsr r0, r0, #24 5a4: e083 b 0x6ae ; line 5a6: 1c08 mov r0, r1 (add r0, r1, #0) 5a8: e081 b 0x6ae ; high band (1800) 5aa: 6a54 ldr r4, [r2, #36] ; 0x24 5ac: 42a0 cmp r0, r4 5ae: d901 bls 0x5b4 5b0: 1c05 mov r5, r0 (add r5, r0, #0) 5b2: e001 b 0x5b8 5b4: 2120 mov r1, #32 ; 0x20 5b6: 180d add r5, r1, r0 5b8: 4b45 ldr r3, =_MIN_TXPWR_DCS ; via 0x6d0 5ba: 4943 ldr r1, =_l1a_l1s_com+0x336 ; via 0x6c8 5bc: 7809 ldrb r1, [r1, #0] 5be: 5c59 ldrb r1, [r3, r1] 5c0: 42a1 cmp r1, r4 5c2: d901 bls 0x5c8 5c4: 1c0b mov r3, r1 (add r3, r1, #0) 5c6: e001 b 0x5cc 5c8: 2320 mov r3, #32 ; 0x20 5ca: 185b add r3, r3, r1 5cc: 429d cmp r5, r3 5ce: db11 blt 0x5f4 ; line 5d0: 42a0 cmp r0, r4 5d2: d901 bls 0x5d8 5d4: 1c01 mov r1, r0 (add r1, r0, #0) 5d6: e001 b 0x5dc 5d8: 2120 mov r1, #32 ; 0x20 5da: 1809 add r1, r1, r0 5dc: 6a13 ldr r3, [r2, #32] ; 0x20 5de: 42a3 cmp r3, r4 5e0: d802 bhi 0x5e8 5e2: 2220 mov r2, #32 ; 0x20 5e4: 18d2 add r2, r2, r3 5e6: e000 b 0x5ea 5e8: 1c1a mov r2, r3 (add r2, r3, #0) 5ea: 4291 cmp r1, r2 5ec: d95f bls 0x6ae ; line 5ee: 0618 lsl r0, r3, #24 5f0: 0e00 lsr r0, r0, #24 5f2: e05c b 0x6ae ; line 5f4: 1c08 mov r0, r1 (add r0, r1, #0) 5f6: e05a b 0x6ae ; case DCS1800: 5f8: 6a54 ldr r4, [r2, #36] ; 0x24 5fa: 42a0 cmp r0, r4 5fc: d901 bls 0x602 5fe: 1c05 mov r5, r0 (add r5, r0, #0) 600: e001 b 0x606 602: 2120 mov r1, #32 ; 0x20 604: 180d add r5, r1, r0 606: 4932 ldr r1, =_MIN_TXPWR_DCS ; via 0x6d0 608: 4b2d ldr r3, =_l1a_l1s_com+0x335 ; via 0x6c0 60a: 781b ldrb r3, [r3, #0] 60c: 5cc9 ldrb r1, [r1, r3] 60e: 42a1 cmp r1, r4 610: d901 bls 0x616 612: 1c0b mov r3, r1 (add r3, r1, #0) 614: e001 b 0x61a 616: 2320 mov r3, #32 ; 0x20 618: 185b add r3, r3, r1 61a: 429d cmp r5, r3 61c: db11 blt 0x642 ; line 61e: 42a0 cmp r0, r4 620: d901 bls 0x626 622: 1c01 mov r1, r0 (add r1, r0, #0) 624: e001 b 0x62a 626: 2120 mov r1, #32 ; 0x20 628: 1809 add r1, r1, r0 62a: 69d3 ldr r3, [r2, #28] ; 0x1c 62c: 42a3 cmp r3, r4 62e: d802 bhi 0x636 630: 2220 mov r2, #32 ; 0x20 632: 18d2 add r2, r2, r3 634: e000 b 0x638 636: 1c1a mov r2, r3 (add r2, r3, #0) 638: 4291 cmp r1, r2 63a: d938 bls 0x6ae ; line 63c: 0618 lsl r0, r3, #24 63e: 0e00 lsr r0, r0, #24 640: e035 b 0x6ae ; line 642: 1c08 mov r0, r1 (add r0, r1, #0) 644: e033 b 0x6ae ; case PCS1900: 646: 6a54 ldr r4, [r2, #36] ; 0x24 648: 42a0 cmp r0, r4 64a: d901 bls 0x650 64c: 1c05 mov r5, r0 (add r5, r0, #0) 64e: e001 b 0x654 650: 2120 mov r1, #32 ; 0x20 652: 180d add r5, r1, r0 654: 4b1b ldr r3, =_MIN_TXPWR_PCS ; via 0x6c4 656: 491a ldr r1, =_l1a_l1s_com+0x335 ; via 0x6c0 658: 7809 ldrb r1, [r1, #0] 65a: 5c59 ldrb r1, [r3, r1] 65c: 42a1 cmp r1, r4 65e: d901 bls 0x664 660: 1c0b mov r3, r1 (add r3, r1, #0) 662: e001 b 0x668 664: 2320 mov r3, #32 ; 0x20 666: 185b add r3, r3, r1 668: 429d cmp r5, r3 66a: db11 blt 0x690 ; line 66c: 42a0 cmp r0, r4 66e: d901 bls 0x674 670: 1c01 mov r1, r0 (add r1, r0, #0) 672: e001 b 0x678 674: 2120 mov r1, #32 ; 0x20 676: 1809 add r1, r1, r0 678: 69d3 ldr r3, [r2, #28] ; 0x1c 67a: 42a3 cmp r3, r4 67c: d802 bhi 0x684 67e: 2220 mov r2, #32 ; 0x20 680: 18d2 add r2, r2, r3 682: e000 b 0x686 684: 1c1a mov r2, r3 (add r2, r3, #0) 686: 4291 cmp r1, r2 688: d911 bls 0x6ae ; line 68a: 0618 lsl r0, r3, #24 68c: 0e00 lsr r0, r0, #24 68e: e00e b 0x6ae ; line 690: 1c08 mov r0, r1 (add r0, r1, #0) 692: e00c b 0x6ae ; case GSM: ; case GSM_E: 694: 4b0d ldr r3, =_MIN_TXPWR_GSM ; via 0x6cc 696: 490a ldr r1, =_l1a_l1s_com+0x335 ; via 0x6c0 698: 7809 ldrb r1, [r1, #0] 69a: 5c59 ldrb r1, [r3, r1] 69c: 4288 cmp r0, r1 69e: db05 blt 0x6ac ; line 6a0: 69d1 ldr r1, [r2, #28] ; 0x1c 6a2: 4288 cmp r0, r1 6a4: d903 bls 0x6ae ; line 6a6: 0608 lsl r0, r1, #24 6a8: 0e00 lsr r0, r0, #24 6aa: e000 b 0x6ae ; line 6ac: 1c08 mov r0, r1 (add r0, r1, #0) ; line 6ae: bd30 pop {r4, r5, pc} ; End function Conclusion: the logic contained in the above disassembly is exactly the same as in the available C code, but there must have been some change to the code expression that results in different output from the compiler.